| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of chipping in a cutting edge even if intermittent cutting is performed by double cutting by similarly forming a hard coated layer in a specific average layer thickness by a chemical vapor deposition method and/or a physical vapor deposition method. SOLUTION: In a vacuum, heat treatment of heating is performed on a base body on which at least a part in the thickness direction of a growth suppressing hard layer and a de-βphase zone of a cutting edge ridgeline part is removed by honing work, and a de-βphase zone having an average layer thickness of 5 to 30μm is formed in the substantially same thickness over a cutting face, the cutting edge ridgeline part and a flank relief in a base body surface part. Next, a hard coated layer composed of one kind of single layer or two or more kinds of plural layers among TiC, TiN, TiCN, TiCO and TiCNO and also Al2 O3 , is formed in an average layer thickness of 5 to 20μm over the whole surface of the base body by a chemical vapor deposition method and/or a physical vapor deposition method.
|
